My 2006 Sonata starts very hard. It turns over good, but takes a long time to fire and seems to be getting worse. The dealer replaced all timming belts and tensioner, plugs and air filter six months ago. Please help!

 

My 2003 sonata won't start right away, after it sat for a while. Found out the fuel pressure regulator was bad (the regulator keeps the fuel rail pressurized). I bought a new one online for $50 and it only took 20 minutes to replace. Now it starts right up.